Is Garcinia Cambogia safe for teens?

Ok so, I'm 14 (female) 5'8 and like. really really heavy and need to lose weight. I know I can just do it with healthy diet and excising but I need to lose it.. fast.. I know all diet pills say not to take under the age of 18 and I read the side affects like lowering blood sugar, headaches, and nausea but is that it? If I take it should I just take less than an adult should? The only thing I'm worried about is if it can kill me. I can deal with side affects.